llvm/llvm/lib/Transforms/ObjCARC/ObjCARCAPElim.cpp

//===- ObjCARCAPElim.cpp - ObjC ARC Optimization --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines ObjC ARC optimizations. ARC stands for Automatic
/// Reference Counting and is a system for managing reference counts for objects
/// in Objective C.
///
/// This specific file implements optimizations which remove extraneous
/// autorelease pools.
///
/// WARNING: This file knows about certain library functions. It recognizes them
/// by name, and hardwires knowledge of their semantics.
///
/// WARNING: This file knows about how certain Objective-C library functions are
/// used. Naive LLVM IR transformations which would otherwise be
/// behavior-preserving may break these assumptions.
///
//===----------------------------------------------------------------------===//

#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/ObjCARCAnalysisUtils.h"
#include "llvm/Analysis/ObjCARCInstKind.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/ObjCARC.h"

usingnamespacellvm;
usingnamespacellvm::objcarc;

#define DEBUG_TYPE …

namespace {

/// Interprocedurally determine if calls made by the given call site can
/// possibly produce autoreleases.
bool MayAutorelease(const CallBase &CB, unsigned Depth = 0) { … }

bool OptimizeBB(BasicBlock *BB) { … }

bool runImpl(Module &M) { … }

} // namespace

PreservedAnalyses ObjCARCAPElimPass::run(Module &M, ModuleAnalysisManager &AM) { … }